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Medical Definition of Clasp-knife rigidity
1. Initial increased resistance to stretch of the extensor muscles of a joint that give way rather suddenly allowing the joint then to be easily flexed; the rigidity is due to an exaggeration of the stretch reflex. See: lengthening reaction. Synonym: clasp-knife effect, clasp-knife rigidity. (05 Mar 2000)
Lexicographical Neighbors of Clasp-knife Rigidity
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